Process for producing lens, and lens

Abstract

A process for producing a lens is provided that includes a step of preparing a silicone resin composition that includes an organopolysiloxane containing a constituent unit represented by Formula (I), and a step of curing the silicone resin composition in a mold at a temperature of at least 220° C. There is also provided a lens produced by the production process.

1 . A process for producing a lens, the process comprising:
 a step of preparing a silicone resin composition comprising an organopolysiloxane containing a constituent unit represented by Formula (I); and   a step of curing the silicone resin composition in a mold at a temperature of at least 220° C.   
     
       
         
         
             
             
         
       
     
   
   
       2 . The process for producing a lens according to  claim 1 , wherein at least 3 mol % of the silicon atoms contained in the organopolysiloxane are silicon atoms contained in the constituent unit represented by Formula (I). 
   
   
       3 . The process for producing a lens according to  claim 1 , wherein at least 30 mol % of the vinyl groups contained in the organopolysiloxane are vinyl groups contained in the constituent unit represented by Formula (I). 
   
   
       4 . The process for producing a lens according to  claim 1 , wherein the organopolysiloxane is represented by Compositional Formula (A),
   R 1   a R 2   b SiO (4-a-b)/2   (A)   
     (in Formula (A), R 1  denotes a vinyl group, R 2  denotes independently unsubstituted or substituted monovalent hydrocarbon groups (excluding a vinyl group), a is 0.03 to 0.50, and a+b is 0.5 to 1.20.) 
   
   
       5 . The process for producing a lens according to  claim 1 , wherein the organopolysiloxane is represented by Compositional Formula (B),
   Vi c Ph d Me e SiO (4-c-d-e)/2   (B)   
     (in Formula (B), Vi denotes a vinyl group, Ph denotes a phenyl group, Me denotes a methyl group, c is 0.01 to 3, d is 0 to 2.99, and e is 0 to 2.99.) 
   
   
       6 . The process for producing a lens according to  claim 1 , wherein the organopolysiloxane has a glass transition temperature of 110° C. to 310° C. 
   
   
       7 . The process for producing a lens according to  claim 1 , wherein 30 to 95 mol % of the silicon atoms contained in the organopolysiloxane are silicon atoms contained in a constituent unit represented by Formula (II). 
     
       
         
         
             
             
         
       
     
   
   
       8 . A lens produced by the production process according to  claim 1 .